Ejemplo n.º 1
0
Archivo: libxl_dm.c Proyecto: jsgf/xen
void libxl__spawn_stub_dm(libxl__egc *egc, libxl__stub_dm_spawn_state *sdss)
{
    STATE_AO_GC(sdss->dm.spawn.ao);
    libxl_ctx *ctx = libxl__gc_owner(gc);
    int ret;
    libxl_device_vfb *vfb;
    libxl_device_vkb *vkb;
    char **args;
    struct xs_permissions perm[2];
    xs_transaction_t t;

    /* convenience aliases */
    libxl_domain_config *const dm_config = &sdss->dm_config;
    libxl_domain_config *const guest_config = sdss->dm.guest_config;
    const int guest_domid = sdss->dm.guest_domid;
    libxl__domain_build_state *const d_state = sdss->dm.build_state;
    libxl__domain_build_state *const stubdom_state = &sdss->dm_state;

    if (guest_config->b_info.device_model_version !=
        LIBXL_DEVICE_MODEL_VERSION_QEMU_XEN_TRADITIONAL) {
        ret = ERROR_INVAL;
        goto out;
    }

    sdss->pvqemu.guest_domid = 0;

    libxl_domain_create_info_init(&dm_config->c_info);
    dm_config->c_info.type = LIBXL_DOMAIN_TYPE_PV;
    dm_config->c_info.name = libxl__stub_dm_name(gc,
                                    libxl__domid_to_name(gc, guest_domid));
    dm_config->c_info.ssidref = guest_config->b_info.device_model_ssidref;

    libxl_uuid_generate(&dm_config->c_info.uuid);

    libxl_domain_build_info_init(&dm_config->b_info);
    libxl_domain_build_info_init_type(&dm_config->b_info, LIBXL_DOMAIN_TYPE_PV);

    dm_config->b_info.max_vcpus = 1;
    dm_config->b_info.max_memkb = 32 * 1024;
    dm_config->b_info.target_memkb = dm_config->b_info.max_memkb;

    dm_config->b_info.u.pv.features = "";

    dm_config->b_info.device_model_version =
        guest_config->b_info.device_model_version;
    dm_config->b_info.device_model =
        guest_config->b_info.device_model;
    dm_config->b_info.extra = guest_config->b_info.extra;
    dm_config->b_info.extra_pv = guest_config->b_info.extra_pv;
    dm_config->b_info.extra_hvm = guest_config->b_info.extra_hvm;

    dm_config->disks = guest_config->disks;
    dm_config->num_disks = guest_config->num_disks;

    libxl__dm_vifs_from_hvm_guest_config(gc, guest_config, dm_config);

    dm_config->c_info.run_hotplug_scripts =
        guest_config->c_info.run_hotplug_scripts;

    ret = libxl__domain_create_info_setdefault(gc, &dm_config->c_info);
    if (ret) goto out;
    ret = libxl__domain_build_info_setdefault(gc, &dm_config->b_info);
    if (ret) goto out;

    GCNEW(vfb);
    GCNEW(vkb);
    libxl__vfb_and_vkb_from_hvm_guest_config(gc, guest_config, vfb, vkb);
    dm_config->vfbs = vfb;
    dm_config->num_vfbs = 1;
    dm_config->vkbs = vkb;
    dm_config->num_vkbs = 1;

    stubdom_state->pv_kernel.path
        = libxl__abs_path(gc, "ioemu-stubdom.gz", libxl__xenfirmwaredir_path());
    stubdom_state->pv_cmdline = libxl__sprintf(gc, " -d %d", guest_domid);
    stubdom_state->pv_ramdisk.path = "";

    /* fixme: this function can leak the stubdom if it fails */
    ret = libxl__domain_make(gc, &dm_config->c_info, &sdss->pvqemu.guest_domid);
    if (ret)
        goto out;
    uint32_t dm_domid = sdss->pvqemu.guest_domid;
    ret = libxl__domain_build(gc, dm_config, dm_domid, stubdom_state);
    if (ret)
        goto out;

    args = libxl__build_device_model_args(gc, "stubdom-dm", guest_domid,
                                          guest_config, d_state);
    if (!args) {
        ret = ERROR_FAIL;
        goto out;
    }

    libxl__write_stub_dmargs(gc, dm_domid, guest_domid, args);
    libxl__xs_write(gc, XBT_NULL,
                   libxl__sprintf(gc, "%s/image/device-model-domid",
                                  libxl__xs_get_dompath(gc, guest_domid)),
                   "%d", dm_domid);
    libxl__xs_write(gc, XBT_NULL,
                   libxl__sprintf(gc, "%s/target",
                                  libxl__xs_get_dompath(gc, dm_domid)),
                   "%d", guest_domid);
    ret = xc_domain_set_target(ctx->xch, dm_domid, guest_domid);
    if (ret<0) {
        LIBXL__LOG_ERRNO(ctx, LIBXL__LOG_ERROR,
                         "setting target domain %d -> %d",
                         dm_domid, guest_domid);
        ret = ERROR_FAIL;
        goto out;
    }
    xs_set_target(ctx->xsh, dm_domid, guest_domid);

    perm[0].id = dm_domid;
    perm[0].perms = XS_PERM_NONE;
    perm[1].id = guest_domid;
    perm[1].perms = XS_PERM_READ;
retry_transaction:
    t = xs_transaction_start(ctx->xsh);
    xs_mkdir(ctx->xsh, t,
        libxl__sprintf(gc, "/local/domain/0/device-model/%d", guest_domid));
    xs_set_permissions(ctx->xsh, t,
        libxl__sprintf(gc, "/local/domain/0/device-model/%d", guest_domid),
                       perm, ARRAY_SIZE(perm));
    if (!xs_transaction_end(ctx->xsh, t, 0))
        if (errno == EAGAIN)
            goto retry_transaction;

    libxl__multidev_begin(ao, &sdss->multidev);
    sdss->multidev.callback = spawn_stub_launch_dm;
    libxl__add_disks(egc, ao, dm_domid, dm_config, &sdss->multidev);
    libxl__multidev_prepared(egc, &sdss->multidev, 0);

    return;

out:
    assert(ret);
    spawn_stubdom_pvqemu_cb(egc, &sdss->pvqemu, ret);
}
Ejemplo n.º 2
0
static void initiate_domain_create(libxl__egc *egc,
                                   libxl__domain_create_state *dcs)
{
    STATE_AO_GC(dcs->ao);
    libxl_ctx *ctx = libxl__gc_owner(gc);
    uint32_t domid;
    int i, ret;
    size_t last_devid = -1;
    bool pod_enabled = false;

    /* convenience aliases */
    libxl_domain_config *const d_config = dcs->guest_config;
    const int restore_fd = dcs->restore_fd;
    memset(&dcs->build_state, 0, sizeof(dcs->build_state));

    domid = 0;

    /* If target_memkb is smaller than max_memkb, the subsequent call
     * to libxc when building HVM domain will enable PoD mode.
     */
    pod_enabled = (d_config->c_info.type == LIBXL_DOMAIN_TYPE_HVM) &&
        (d_config->b_info.target_memkb < d_config->b_info.max_memkb);

    /* We cannot have PoD and PCI device assignment at the same time
     * for HVM guest. It was reported that IOMMU cannot work with PoD
     * enabled because it needs to populated entire page table for
     * guest. To stay on the safe side, we disable PCI device
     * assignment when PoD is enabled.
     */
    if (d_config->c_info.type == LIBXL_DOMAIN_TYPE_HVM &&
        d_config->num_pcidevs && pod_enabled) {
        ret = ERROR_INVAL;
        LOG(ERROR, "PCI device assignment for HVM guest failed due to PoD enabled");
        goto error_out;
    }

    ret = libxl__domain_create_info_setdefault(gc, &d_config->c_info);
    if (ret) goto error_out;

    ret = libxl__domain_make(gc, &d_config->c_info, &domid);
    if (ret) {
        LIBXL__LOG(ctx, LIBXL__LOG_ERROR, "cannot make domain: %d", ret);
        dcs->guest_domid = domid;
        ret = ERROR_FAIL;
        goto error_out;
    }

    dcs->guest_domid = domid;
    dcs->dmss.dm.guest_domid = 0; /* means we haven't spawned */

    ret = libxl__domain_build_info_setdefault(gc, &d_config->b_info);
    if (ret) goto error_out;

    if (!sched_params_valid(gc, domid, &d_config->b_info.sched_params)) {
        LOG(ERROR, "Invalid scheduling parameters\n");
        ret = ERROR_INVAL;
        goto error_out;
    }

    for (i = 0; i < d_config->num_disks; i++) {
        ret = libxl__device_disk_setdefault(gc, &d_config->disks[i]);
        if (ret) goto error_out;
    }

    dcs->bl.ao = ao;
    libxl_device_disk *bootdisk =
        d_config->num_disks > 0 ? &d_config->disks[0] : NULL;

    /*
     * The devid has to be set before launching the device model. For the
     * hotplug case this is done in libxl_device_nic_add but on domain
     * creation this is called too late.
     * Make two runs over configured NICs in order to avoid duplicate IDs
     * in case the caller partially assigned IDs.
     */
    for (i = 0; i < d_config->num_nics; i++) {
        /* We have to init the nic here, because we still haven't
         * called libxl_device_nic_add when domcreate_launch_dm gets called,
         * but qemu needs the nic information to be complete.
         */
        ret = libxl__device_nic_setdefault(gc, &d_config->nics[i], domid);
        if (ret) goto error_out;

        if (d_config->nics[i].devid > last_devid)
            last_devid = d_config->nics[i].devid;
    }
    for (i = 0; i < d_config->num_nics; i++) {
        if (d_config->nics[i].devid < 0)
            d_config->nics[i].devid = ++last_devid;
    }

    if (restore_fd >= 0) {
        LOG(DEBUG, "restoring, not running bootloader\n");
        domcreate_bootloader_done(egc, &dcs->bl, 0);
    } else  {
        LOG(DEBUG, "running bootloader");
        dcs->bl.callback = domcreate_bootloader_done;
        dcs->bl.console_available = domcreate_bootloader_console_available;
        dcs->bl.info = &d_config->b_info;
        dcs->bl.disk = bootdisk;
        dcs->bl.domid = dcs->guest_domid;

        dcs->bl.kernel = &dcs->build_state.pv_kernel;
        dcs->bl.ramdisk = &dcs->build_state.pv_ramdisk;

        libxl__bootloader_run(egc, &dcs->bl);
    }
    return;

error_out:
    assert(ret);
    domcreate_complete(egc, dcs, ret);
}
Ejemplo n.º 3
0
static void initiate_domain_create(libxl__egc *egc,
                                   libxl__domain_create_state *dcs)
{
    STATE_AO_GC(dcs->ao);
    libxl_ctx *ctx = libxl__gc_owner(gc);
    uint32_t domid;
    int i, ret;

    /* convenience aliases */
    libxl_domain_config *const d_config = dcs->guest_config;
    const int restore_fd = dcs->restore_fd;
    memset(&dcs->build_state, 0, sizeof(dcs->build_state));

    domid = 0;

    ret = libxl__domain_create_info_setdefault(gc, &d_config->c_info);
    if (ret) goto error_out;

    ret = libxl__domain_make(gc, &d_config->c_info, &domid);
    if (ret) {
        LIBXL__LOG(ctx, LIBXL__LOG_ERROR, "cannot make domain: %d", ret);
        dcs->guest_domid = domid;
        ret = ERROR_FAIL;
        goto error_out;
    }

    dcs->guest_domid = domid;
    dcs->dmss.dm.guest_domid = 0; /* means we haven't spawned */

    ret = libxl__domain_build_info_setdefault(gc, &d_config->b_info);
    if (ret) goto error_out;

    if (!sched_params_valid(gc, domid, &d_config->b_info.sched_params)) {
        LOG(ERROR, "Invalid scheduling parameters\n");
        ret = ERROR_INVAL;
        goto error_out;
    }

    for (i = 0; i < d_config->num_disks; i++) {
        ret = libxl__device_disk_setdefault(gc, &d_config->disks[i]);
        if (ret) goto error_out;
    }

    dcs->bl.ao = ao;
    libxl_device_disk *bootdisk =
        d_config->num_disks > 0 ? &d_config->disks[0] : NULL;

    if (restore_fd >= 0) {
        LOG(DEBUG, "restoring, not running bootloader\n");
        domcreate_bootloader_done(egc, &dcs->bl, 0);
    } else  {
        LOG(DEBUG, "running bootloader");
        dcs->bl.callback = domcreate_bootloader_done;
        dcs->bl.console_available = domcreate_bootloader_console_available;
        dcs->bl.info = &d_config->b_info;
        dcs->bl.disk = bootdisk;
        dcs->bl.domid = dcs->guest_domid;

        dcs->bl.kernel = &dcs->build_state.pv_kernel;
        dcs->bl.ramdisk = &dcs->build_state.pv_ramdisk;

        libxl__bootloader_run(egc, &dcs->bl);
    }
    return;

error_out:
    assert(ret);
    domcreate_complete(egc, dcs, ret);
}
Ejemplo n.º 4
0
static int libxl_create_stubdom(libxl_ctx *ctx,
                                libxl_device_model_info *info,
                                libxl_device_disk *disks, int num_disks,
                                libxl_device_nic *vifs, int num_vifs,
                                libxl_device_vfb *vfb,
                                libxl_device_vkb *vkb,
                                libxl__device_model_starting **starting_r)
{
    libxl__gc gc = LIBXL_INIT_GC(ctx);
    int i, num_console = STUBDOM_SPECIAL_CONSOLES, ret;
    libxl_device_console *console;
    libxl_domain_create_info c_info;
    libxl_domain_build_info b_info;
    libxl_domain_build_state state;
    uint32_t domid;
    char **args;
    struct xs_permissions perm[2];
    xs_transaction_t t;
    libxl__device_model_starting *dm_starting = 0;

    args = libxl_build_device_model_args(&gc, info, vifs, num_vifs);
    if (!args) {
        ret = ERROR_FAIL;
        goto out;
    }

    memset(&c_info, 0x00, sizeof(libxl_domain_create_info));
    c_info.hvm = 0;
    c_info.name = libxl__sprintf(&gc, "%s-dm", libxl__domid_to_name(&gc, info->domid));

    libxl_uuid_copy(&c_info.uuid, &info->uuid);

    memset(&b_info, 0x00, sizeof(libxl_domain_build_info));
    b_info.max_vcpus = 1;
    b_info.max_memkb = 32 * 1024;
    b_info.target_memkb = b_info.max_memkb;
    b_info.kernel.path = libxl__abs_path(&gc, "ioemu-stubdom.gz", libxl_xenfirmwaredir_path());
    b_info.u.pv.cmdline = libxl__sprintf(&gc, " -d %d", info->domid);
    b_info.u.pv.ramdisk.path = "";
    b_info.u.pv.features = "";
    b_info.hvm = 0;

    /* fixme: this function can leak the stubdom if it fails */

    ret = libxl__domain_make(ctx, &c_info, &domid);
    if (ret)
        goto out_free;
    ret = libxl__domain_build(ctx, &b_info, domid, &state);
    if (ret)
        goto out_free;

    libxl_write_dmargs(ctx, domid, info->domid, args);
    libxl__xs_write(&gc, XBT_NULL,
                   libxl__sprintf(&gc, "%s/image/device-model-domid", libxl__xs_get_dompath(&gc, info->domid)),
                   "%d", domid);
    libxl__xs_write(&gc, XBT_NULL,
                   libxl__sprintf(&gc, "%s/target", libxl__xs_get_dompath(&gc, domid)),
                   "%d", info->domid);
    ret = xc_domain_set_target(ctx->xch, domid, info->domid);
    if (ret<0) {
        LIBXL__LOG_ERRNO(ctx, LIBXL__LOG_ERROR, "setting target domain %d -> %d", domid, info->domid);
        ret = ERROR_FAIL;
        goto out_free;
    }
    xs_set_target(ctx->xsh, domid, info->domid);

    perm[0].id = domid;
    perm[0].perms = XS_PERM_NONE;
    perm[1].id = info->domid;
    perm[1].perms = XS_PERM_READ;
retry_transaction:
    t = xs_transaction_start(ctx->xsh);
    xs_mkdir(ctx->xsh, t, libxl__sprintf(&gc, "/local/domain/0/device-model/%d", info->domid));
    xs_set_permissions(ctx->xsh, t, libxl__sprintf(&gc, "/local/domain/0/device-model/%d", info->domid), perm, ARRAY_SIZE(perm));
    xs_mkdir(ctx->xsh, t, libxl__sprintf(&gc, "/local/domain/%d/device/vfs", domid));
    xs_set_permissions(ctx->xsh, t, libxl__sprintf(&gc, "/local/domain/%d/device/vfs",domid), perm, ARRAY_SIZE(perm));
    if (!xs_transaction_end(ctx->xsh, t, 0))
        if (errno == EAGAIN)
            goto retry_transaction;

    for (i = 0; i < num_disks; i++) {
        disks[i].domid = domid;
        ret = libxl_device_disk_add(ctx, domid, &disks[i]);
        if (ret)
            goto out_free;
    }
    for (i = 0; i < num_vifs; i++) {
        vifs[i].domid = domid;
        ret = libxl_device_nic_add(ctx, domid, &vifs[i]);
        if (ret)
            goto out_free;
    }
    vfb->domid = domid;
    ret = libxl_device_vfb_add(ctx, domid, vfb);
    if (ret)
        goto out_free;
    vkb->domid = domid;
    ret = libxl_device_vkb_add(ctx, domid, vkb);
    if (ret)
        goto out_free;

    if (info->serial)
        num_console++;

    console = libxl__calloc(&gc, num_console, sizeof(libxl_device_console));
    if (!console) {
        ret = ERROR_NOMEM;
        goto out_free;
    }

    for (i = 0; i < num_console; i++) {
        console[i].devid = i;
        console[i].consback = LIBXL_CONSBACK_IOEMU;
        console[i].domid = domid;
        /* STUBDOM_CONSOLE_LOGGING (console 0) is for minios logging
         * STUBDOM_CONSOLE_SAVE (console 1) is for writing the save file
         * STUBDOM_CONSOLE_RESTORE (console 2) is for reading the save file
         */
        switch (i) {
            char *filename;
            char *name;
            case STUBDOM_CONSOLE_LOGGING:
                name = libxl__sprintf(&gc, "qemu-dm-%s", libxl_domid_to_name(ctx, info->domid));
                libxl_create_logfile(ctx, name, &filename);
                console[i].output = libxl__sprintf(&gc, "file:%s", filename);
                console[i].build_state = &state;
                free(filename);
                break;
            case STUBDOM_CONSOLE_SAVE:
                console[i].output = libxl__sprintf(&gc, "file:"SAVEFILE".%d", info->domid);
                break;
            case STUBDOM_CONSOLE_RESTORE:
                if (info->saved_state)
                    console[i].output = libxl__sprintf(&gc, "pipe:%s", info->saved_state);
                break;
            default:
                console[i].output = "pty";
                break;
        }
        ret = libxl_device_console_add(ctx, domid, &console[i]);
        if (ret)
            goto out_free;
    }
    if (libxl__create_xenpv_qemu(ctx, domid, vfb, &dm_starting) < 0) {
        ret = ERROR_FAIL;
        goto out_free;
    }
    if (libxl__confirm_device_model_startup(ctx, dm_starting) < 0) {
        ret = ERROR_FAIL;
        goto out_free;
    }

    libxl_domain_unpause(ctx, domid);

    if (starting_r) {
        *starting_r = calloc(sizeof(libxl__device_model_starting), 1);
        (*starting_r)->domid = info->domid;
        (*starting_r)->dom_path = libxl__xs_get_dompath(&gc, info->domid);
        (*starting_r)->for_spawn = NULL;
    }

    ret = 0;

out_free:
    free(args);
out:
    libxl__free_all(&gc);
    return ret;
}